Method for stabilizing beta-hemihydrate plaster
a technology of beta-hemihydrate and stabilizing plaster, which is applied in the field of posttreatment of hemihydrate plaster, can solve the problems of high energy consumption, stress on the physical microstructure of -hh, and unstable plaster, and achieve the effect of reducing water demand and lowering water demand
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example 1
on of Stabilized Plasters
[0068]To an amount of 500 g standard HH plaster (including 5.8% of combined water and a purity of 95% as measured by standard methods), a solution of a retardant (Sicit Plastretard PE) at different concentrations but contributing in all situation to 0.02% by weight based on weight of the plaster, was added to provide a moisture residual content of 1.5; 2.0 and 2.6%. The treated compositions were mixed with a wire whisk for 20 seconds and treated with an immersion blender until tactical knots are gone. The stabilized plasters thus prepared were then cured for 10 min; 30 min or 24 h and the product was dried into a final powder.
example 2
n of Slump
[0069]The plasters prepared in example 1 with a moisture of 1.5, 2.0 and 2.6% (standard ASTM 471 M for powder humidity) cured for 10 minutes were tested for slumps using a cylinder of 71×43 mm. The slump values were measured and compared. A cylinder of 71×43 mm has a slightly higher volume than the Schmidt ring but offers comparable results with conventional rings since the larger volume is compensated by the lower height.
[0070]FIG. 1 shows that all the plasters that were stabilized according to the invention exhibit a much higher slump which denotes a higher flowability in comparison to the products that are stabilized in the prior art. The results measured for the plasters prepared according to the prior art or further treated with retardant at the time of the preparation of slump cannot provide the same advantageous properties.
example 3
lity to Different Plaster Types
[0071]Samples of different stabilized plasters types taken from 3 different plants of the applicant were prepared according to the procedure detailed in example 1 and slumps were prepared for each samples using the same cylinder as in example 2. For each sample stabilized according to the invention, the ratio water / slurry ratios required to provide a slump of about 150 mm (mechanical stirring) using a conventional cylinder was systematically at least 10% lower compared to the corresponding samples that were stabilized using the conventional process.
[0072]Therefore, the process and plasters of the invention show advantageous properties and uses in different plaster types.
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Abstract
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